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// $Id$
// Defines the member functions for the memory mapping facility.
#define ACE_BUILD_DLL
#include "ace/Mem_Map.h"
#if !defined (__ACE_INLINE__)
#include "ace/Mem_Map.i"
#endif /* __ACE_INLINE__ */
ACE_RCSID(ace, Mem_Map, "$Id$")
ACE_ALLOC_HOOK_DEFINE(ACE_Mem_Map)
void
ACE_Mem_Map::dump (void) const
{
ACE_TRACE ("ACE_Mem_Map::dump");
ACE_DEBUG ((LM_DEBUG, ACE_BEGIN_DUMP, this));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("base_addr_ = %x"), this->base_addr_));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("\nfilename_ = %s"), this->filename_));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("\nlength_ = %d"), this->length_));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("\nhandle_ = %d"), this->handle_));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("\nfile_mapping_ = %d"), this->file_mapping_));
ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("\nclose_handle_ = %d"), this->close_handle_));
ACE_DEBUG ((LM_DEBUG, ACE_END_DUMP));
}
int
ACE_Mem_Map::close (void)
{
ACE_TRACE ("ACE_Mem_Map::close");
this->unmap ();
return this->close_handle ();
}
ACE_Mem_Map::~ACE_Mem_Map (void)
{
ACE_TRACE ("ACE_Mem_Map::~ACE_Mem_Map");
this->close ();
}
// This function does the dirty work of actually calling ACE_OS::mmap
// to map the file into memory.
int
ACE_Mem_Map::map_it (ACE_HANDLE handle,
int len_request,
int prot,
int share,
void *addr,
off_t pos,
LPSECURITY_ATTRIBUTES sa)
{
ACE_TRACE ("ACE_Mem_Map::map_it");
this->base_addr_ = addr;
this->handle_ = handle;
long result = ACE_OS::filesize (this->handle_);
if (result == -1)
return -1;
// At this point we know <result> is not negative...
size_t file_len = ACE_static_cast (size_t, result);
if (this->length_ < file_len)
{
// If the length of the mapped region is less than the length of
// the file then we force a complete new remapping by setting
// the descriptor to ACE_INVALID_HANDLE (closing down the
// descriptor if necessary).
this->close_filemapping_handle ();
}
// Check to see if we need to extend the backing store
int extend_backing_store = 0;
if (len_request != -1)
{
if (file_len < ACE_static_cast (size_t, len_request))
extend_backing_store = 1;
// Set length to len_request
this->length_ = len_request;
}
else
{
// Set length to file_request
this->length_ = file_len;
}
if (extend_backing_store)
// Extend the backing store.
if (ACE_OS::pwrite (this->handle_, "", 1,
this->length_ > 0 ? this->length_ - 1 : 0) == -1)
return -1;
#if defined (__Lynx__)
// Set flag that indicates whether PROT_WRITE has been enabled.
write_enabled_ = prot & PROT_WRITE ? 1 : 0;
#endif /* __Lynx__ */
this->base_addr_ = ACE_OS::mmap (this->base_addr_,
this->length_,
prot,
share,
this->handle_,
off_t (ACE::round_to_allocation_granularity (pos)),
&this->file_mapping_,
sa);
return this->base_addr_ == MAP_FAILED ? -1 : 0;
}
int
ACE_Mem_Map::open (LPCTSTR file_name,
int flags,
int mode,
LPSECURITY_ATTRIBUTES sa)
{
ACE_TRACE ("ACE_Mem_Map::open");
ACE_OS::strncpy (this->filename_, file_name, MAXPATHLEN);
this->handle_ = ACE_OS::open (file_name, flags, mode, sa);
if (this->handle_ == ACE_INVALID_HANDLE)
return -1;
else
{
this->close_handle_ = 1;
return 0;
}
}
int
ACE_Mem_Map::map (LPCTSTR file_name,
int len,
int flags,
int mode,
int prot,
int share,
void *addr,
off_t pos,
LPSECURITY_ATTRIBUTES sa)
{
ACE_TRACE ("ACE_Mem_Map::map");
this->length_ = 0;
if (this->open (file_name, flags, mode, sa) == -1)
return -1;
else
return this->map_it (this->handle (), len, prot, share, addr, pos, sa);
}
ACE_Mem_Map::ACE_Mem_Map (void)
: base_addr_ (MAP_FAILED),
length_ (0),
handle_ (ACE_INVALID_HANDLE),
file_mapping_ (ACE_INVALID_HANDLE),
close_handle_ (0)
{
ACE_TRACE ("ACE_Mem_Map::ACE_Mem_Map");
ACE_OS::memset (this->filename_, 0, sizeof this->filename_);
}
// Map a file specified by FILE_NAME.
ACE_Mem_Map::ACE_Mem_Map (LPCTSTR file_name,
int len,
int flags,
int mode,
int prot,
int share,
void *addr,
off_t pos,
LPSECURITY_ATTRIBUTES sa)
: base_addr_ (MAP_FAILED),
length_ (0),
handle_ (ACE_INVALID_HANDLE),
file_mapping_ (ACE_INVALID_HANDLE),
close_handle_ (0)
{
ACE_TRACE ("ACE_Mem_Map::ACE_Mem_Map");
if (this->map (file_name, len, flags, mode, prot, share, addr, pos, sa) < 0)
ACE_ERROR ((LM_ERROR, ASYS_TEXT ("%p\n"), ASYS_TEXT ("ACE_Mem_Map::ACE_Mem_Map")));
}
// Map a file from an open file descriptor HANDLE. This function will
// lookup the length of the file if it is not given.
ACE_Mem_Map::ACE_Mem_Map (ACE_HANDLE handle,
int len,
int prot,
int share,
void *addr,
off_t pos,
LPSECURITY_ATTRIBUTES sa)
: base_addr_ (MAP_FAILED),
length_ (0),
handle_ (ACE_INVALID_HANDLE),
file_mapping_ (ACE_INVALID_HANDLE),
close_handle_ (0)
{
ACE_TRACE ("ACE_Mem_Map::ACE_Mem_Map");
ACE_OS::memset (this->filename_, 0, sizeof this->filename_);
if (this->map (handle, len, prot, share, addr, pos, sa) < 0)
ACE_ERROR ((LM_ERROR, ASYS_TEXT ("%p\n"), ASYS_TEXT ("ACE_Mem_Map::ACE_Mem_Map")));
}
// Close down and remove the file from the file system.
int
ACE_Mem_Map::remove (void)
{
ACE_TRACE ("ACE_Mem_Map::remove");
ACE_OS::ftruncate (this->handle_, 0);
this->close ();
if (this->filename_[0] != '\0')
return ACE_OS::unlink (this->filename_);
else
return 0;
}
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